Mounting means for grinding-wheels



W. H. SUMBLING.

MOUNTING MEANS FOR GRINDING WHEELS- APPLICATION FILED MAB. 9. i920.

Patented ApnlZ, 1921.

UNITED STATES raraur orrics.

WILLIAM HENRY SUMBLING, 0F TORONTO, ONTARIO, CANADA.

MOUNTING MEANS FOR GRINDING-WHEELS.

To all whom it may concern.-

Be it known that I, WILLIAM HENRY SUMBLING, a subject of the King of Great Britain, of the city of Toronto, county of York, Province of Ontario, Canada, have invented certain new and useful Improvements in Mounting Means for Grinding-lVheels, of which the following is a specification.

My invention relates to improvements in mounting means for grinding wheels, and the principal object of the invention is to so construct the arbor and the inner flange or collar adapted to positively rotate therewith, so that when the component parts of the mounting means are finally positioned no uneven strains or stresses will be brought to bear against the said flange that would tend to move its inner face out of right angles to the axis of said arbor, thereby insuring that the grinding wheel shall be made to run true on the arbor and not wabble, thus removing danger of the wheel bursting because of improper mounting. A still further object of the invention is to provide improved means for positively coupling the grinding-wheel to the arbor without in any manner weakening the arbor, and to secure the advantages of cheapness of manufacture, facility in assembling the parts, and ease with which the grinding .wheel can be removed and replaced.

In the following specification, I shall set forth the preferred construction whereby the objects of my invention are carried out, and what I claim as new will be set forth in the claims forming part of this specification.

Figure 1 is a perspective view of my preferred form of improved mountlng means for a grinding wheel. Fig. 2 is, in part, a cross section on the line 2-2, Fig. 1. Fig. 3 is a cross section through the hub of the inner flange or collar and one end of the arbor, showing the preferred manner in which the said flange is interlocked with said arbor, and Fig. 4 is an end elevation of the end of the arbor on which the grinding wheel is mounted.

In the drawings, like characters of reference refer to the same parts.

It is now a common practice to secure the inner flange or collar to the arbor either by threading or shrinking the same thereon, or by constructing a key-way in the arbor and in the flange to accommodate a key whereby the flange or collar is locked to said arbor.

After so mounting the said flange Specification of Letters Patent. Pat t d Apr. 12, 1921 Application filed March 9, 1920.

Serial No. 364,575.

or collar, the arbor is placed in a lathe, and the inner face of the said flange or collar turned so that it will occupy a right angle to the longitudinal axis of said arbor. Now the methods just described are unnecessarily expensive, and furthermore when key-ways are made, the reduced end of the arbor is necessarily weakened at one point, thus sacrlficing security to that extent. When used, particularly with a key, wear occurs, and the key frequently has to be tightened up, and the result is that there is a tendenc to exert strain against one side only, of the flange or collar with the result that under working conditions the inner face of said flange or collar will not be at right angles.

The next step is to remove opposite portions of the annular shoulder O longitudinally of the arbor A for the desired distance, thus forming flat faces L, which are substantially parallel to each other. This construction in effect forms a key at one end of the unreduced portion of the arbor A. E is the inner flange or the collar, and secured to, or formed a part thereof, is a hub H in the preferred form of construction. The blank comprising the flange or collar E is mounted in a lathe, and the inner face thereof turned so as to be at right angles to the longitudinal axis thereof, and then the hole a is drilled through said flange or collar and the hub H thereof. The partly-manufactured flange or collar is then placed face down onthe table of a milling machine, and the hub H is cut into two portions thus providing a slot I, which is preferably of the same depth as the depth of the hub H. This operation forms the faces 5 and c, which necessarily will occupy the same plane and will be parallel to the inner face of the said flange or collar E.

The flange or collar E is placed on the arbor A, and as the width of the slot I between the walls J thereof is very slightly greater than the distance between the faces L, the said hub H straddles the arbor A and co-acts therewith so as to be keyed thereto and positively rotate therewith.

Since the face of the annular shoulder 'O is at right angles to the longitudinal axis of the arbor A, when the flange or collar E is placed in position on the arbor A, all portions of the face of the said annular shoulder 0- will be in contact with their opposing portions of the faces 6 and c of the flange or collar E, so there will be no possible chance of any uneven strains being brought into play, which would tend to move the inner face of the flange or collar E out of true.

The result is that the said grinding wheel will be held against wabbling on the reduced end B. As is usual, the grinding wheel C is provided with a metal bushing D, having a bore somewhat greater in diameter than the external diameter of the reduced end B so that said grinding-wheel may be brought into contact with the whole of the bearing surface of the inner face of the flange or collar E.

F is the outer flange or collar preferably used, and G is the nut mounted on the threaded outer end of thereduced end B to clamp the various parts'of the mounting means together.

ltwill be observed upon referring particularly to Figs. 1 and 2 that it is not necessary to have the outer faces (Z of the hub l-l contact with the shoulders P, which are necessarily formed when the arbor A is cut away to form the faces L. By providing the clearance shown clearly in Fig. 2, between the said shoulders and outer faces d, it is not necessary to spend time on truing the two faces 0?, since they will not be brought into contact with said shoulders, and consequently cannot interfere with the true fitting of the flange or collar E against the face of the annular shoulder O.

lhe area of the face of the annular shoulder 0 will be quite ample to provide an eflicient abutment or stop against which the inner flange or collar E will be jammed by the fastening means employed.

The foregoing construction is very simple and very little time is required to assemble the parts.

The inner faces of the flanges or collars E and F may be recessed if desired, to co-act with the grinding-wheel G to couple the same to the arbor A.

It is conceivable that changes in details of construction may be made without departing from the spirit of my invention.

Although I have particularly made use of a grinding-wheel for the purpose of disclosing the objects of my invention, it must be understood that I can mount a circular saw on 1ts arbor by means of my 1nvent1on, and I claim the same as falling w thin the scope of protection sought.

' with hat I claim is,

1. In combination, an arbor provided with a reduced bearing end which terminates at its inner end circular in cross-section at an annular shoulder formed in said arbor with its face at right angles to the longitudinal axis thereof, opposite sides of said annular shoulder being cut away longitudinally of the arbor to form two parallel flat faces which are located outside of said shoulder; inner circular bored flange mounted on said reduced end and having its inner end cut transversely through at one end of said bore to provide two substantially parallel faces spaced apart which coact with the said faces of said shoulder so that said flange will positively turn with said arbor; a grinding-wheel mounted on said reduced end, and means carried by the outer portion of said reduced end whereby said grinding-wheel is clamped in position, and whereby said inner flange is held against said annular shoulder.

2. In combination an arbor provided with a reduced bearing end which terminates at its inner end circular in cross-section at an annular shoulder formed in said arbor with its face at right angles to the longitudinal axis thereof, the opposite sides of said shoulder being cut away longitudinally of the arbor to form two parallel flat faces which are located outside of said shoulder; an inner circular bored flange mounted on said reduced end and having its inner end cut transversely through at one end of said boreto provide two substantially parallel faces spaced apart which co-act the said faces of said shoulder so that said flange will positively turn with said arbor, and having at its outer side two faces occupying the same plane and located on opposite sides of the said bore, the inner face of said flange being turned to occupy a right angle to the axis of said arbor, and located parallel to the said second'mentioned faces; a grinding-wheel mounted on said reduced end, and means carried byfthe outer portion of said reduced end whereby the outer faces of said inner flange are held against said annular shoulder and whereby said grinding-wheel is clamped in place.

3. in combination an arbor provided with a reduced bearing end which terminates at its inner end circular in cross-section at an annular shoulder formed in said arbor with its face at right angles to the longitudinal axis thereof, the opposite sides of said shoulder being cut awaylongitudinally of the arbor to form two parallel flat faces which are located outside of said shoulder; an inner circular bored flange mounted on said reduced end and provided at its inner end with a hub separated into two portions, the faces of which portions are parallel to each other, the said hub straddling said vthereof into contact With their associated faces formed in the opposite sides of said annular shoulder; the cutting of said hub into two portions forming on its outer side two faces occupying the same plane and located on opposite sides of said bore; the inner face of said flange being turned to be at right angles to the axis of said arbor and 10 parallel to the said second-mentioned faces; a grinding-Wheel mounted on said reduced end, and means carried by the outer portion of said reduced end whereby the outer faces of said inner'fiange are held against said 15 annular shoulder and whereby said grinding-Wheel 1s clamped 111 place.

WILLIAM HENRY SUMBLING. 

